Docker using 100% CPU

Asked Jan 19 '18 at 23:44

Active Jan 19 '18 at 23:44

Viewed 6,957 times

As you can see from the graphs below, I am having an interesting issue. I have a 2GB VPS running three Ghost (blogging platform that runs on node) containers. Node's memory usage creeps up and up until about 95% where it does a massive garbage collection. This causes a huge spike on the Disk I/O and CPU kits 100% and then... stays there.

Any ideas what could be going on here? I've been looking around for days and I can't find any helpful information. My web server is still responsive, websites load etc.

asked Jan 19 '18 at 23:44

Karai17

1

What is the output of `docker stats` are you able to SSH to the machine? – Tarun Lalwani Jan 20 '18 at 02:23
I can SSH into the server, `docker stats` comes up blank :\ – Karai17 Jan 20 '18 at 05:14
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what docker version are you using? This indicates that daemon itself is busy instead of the containers. I would suggest you run `journalctl` and see if you can find a issue near the timestamp – Tarun Lalwani Jan 20 '18 at 05:23
I am using the latest stable docker release for CentOS EL 7. – Karai17 Jan 20 '18 at 06:30
I can't really see anything terribly peculiar in journalctl. I see several instances where docker runs a kill command when it reaches out of memory state (because node is stupid). – Karai17 Jan 20 '18 at 06:35
I would suggest you run your node containers with a memory limit specified and see if that helps? – Tarun Lalwani Jan 20 '18 at 06:57
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/163533/discussion-between-tarun-lalwani-and-karai17). – Tarun Lalwani Jan 20 '18 at 07:23
It could be that your server is swapping. Try running `top` in your server and see what process is actually eating CPU – whites11 Jan 20 '18 at 09:49
What is shown in `docker events` – BMitch Jan 20 '18 at 10:39
`dockerd` is using 99% CPU. `docker events` shows nothing at all. – Karai17 Jan 20 '18 at 18:20

Docker using 100% CPU

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